Monday, January 19, 2009

Another Arctic cold snap on it's way...

This forecast package will mainly talk about the upcoming Arctic blast that is set to move into the area later this week...
Meanwhile we will deal with another shot of snow today...Then slightly warmer temps for Tuesday, and Wednesday...

CURRENT CONDITIONS....
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Temps at this hour still remain in the single digits with some 10 degrees being reported closer to the MN border...Radar is showing an area of snow through much of the area...Here at the weather center we just picked up a fast 1/4 inch of snow with one band that came through...Lows last night did drop below zero once again...

SFC ANALYSIS...

Arctic high pressure still in control of our weather..We see another shortwave/Trof coming down in the NW flow out of Canada.We also see out next shot of Arctic air building High pressure over Siberia/Arctic circle...

TODAY THROUGH TONIGHT...

Shortwave/Trof is now working it's way South clouds have been on the increase through the early morning hours...Snow has started to break out through most of the FA....This shall keep going off and on,just like yesterday...Tonight system pulls away from the area light snow/flurries shall becoming to an end.Could see skies become partly cloudy to clear once again..Total snowfall amounts will be around the inch mark...While points to the North of Barron,Polk,and Rusk Counties could see inch an half up to two inches....Temps going to be tricky...Will keep temps in the middle teens From a line from East of Burnett,Polk,and St.Croix Counties....Lower 20s from said line westward...May see some middle 20s closer to the MN border..Using say line for over night lows...Single digits found East of said line..If skies clear out temps could drop to below zero once again...Meanwhile West of said line temp drop to around 10...Once again if skies can clear out temps should drop to into the single digits above zero.....

TUESDAY THROUGH THURSDAY....

Temps still on the tricky side..Swallow pool of Arctic air still in place and skies forecasted to be partly cloudy,along with the sun still at low angles...Thinking is temps shall be colder than model guidance...One has to realize that through out much of this winter and during our bout with clod air model guidance has be warmer that actual observer temps...
We see a warm front working its way across through ND/SD on Tuesday morning.Late in the day this front should be moving through MN..Tuesday night said warm front will be knocking on our door..By 12Z Wednesday warm front will have cleared all of WI,However we see our first in a serious of cold fronts move in late Wednesday evening /Thursday morning time frame.So lets pinpoint the temps...
Using the line above once again....Middle 20s on Tuesday look plausible to the East of said line...To the West of said line middle to upper 20s look like the way to run...Tuesday will keep temps in a range from the lower to middle teens...Wednesday....Again we shall use the same line.....Points East of line shall see upper 20s...Points West I will keep upper 20s until one get closer to the MN border, were here temps could reach to the lower 30s....Thursday I have decide to keep light snow chance alive do to the Arctic cold front moving in, along with a possibility of a shortwave moving in with the cold front...Models having some hard time with as of right now...Also some models trying to slow down the Arctic blast be 12 hours or so..I don't completely buy that just yet,however with the problems with the models, will keep Thursday's highs in the middle 20s...Lows Thursday night should drop to near zero with some spots going below zero...

FRIDAY THROUGH SUNDAY.....

Arctic air will become more established across the FA...Temps will be falling each day...We start of Friday with highs around the 10 to 13 degree mark...By Sunday temps will struggle to reach the middle single digits above...Lows will fall to the lowers teens below zero....

LONG TERM....(MONDAY JAN 26 THROUGH WEDNESDAY JAN 28)

Model showing the cold air lasting right through this period...Some disagreement showing up between the GFS and ECMWF as far as the coldest air setting up...GFS keeps it's to the North,While the ECMWF brings it into the area....Will run with ECMWF as this has been the model of choice for me just about all winter long,it also had a better handle on our last Arctic outbreak,and has kept the so called warmer air to the West of the FA...GFS has been a let down for most of this winter...In the start of each run right up until the last possible minute,then it will jump on the band wagon with other models....We shall see some chance of snow through this period..
LONGER TERM...(JAN 29 THROUGH FEB 4)

Looks to remain cold through this period also....With a chance of some snow...Models showing a couple of possible snowstorms to effect the area...Won't touch that with a 10 foot flag pole,,As this is way to far out there..Will watch it though...